Coaster-brake.



H. B. LESTER.

GOASTER BRAKE.

\ APPLICATION FILED FEB. 28,1911. I 993,385, Patented May 30, 1911.

HARRY B. LESTER, 0F DAYTON, OHIO, ASSIGNOR TO THE DAVIS SEWING MACHINE COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

COASTER-BRAKE.

- Specification of Letters Patent.

Patented'May 30, 1911.

Application filed February 28, 1911-. Serial No. 611,520.

To all whom it may concern;

Be it known that I, HARRY B. LESTER, a citizen of the United States, residing at Dayton, in the county of vIVlontgomery and State of Ohio, have invented a new and useful Improvement in Coaster-Brakes, of

which the following is a specification.

Thisinvention relates to .those rear-wheel turn, is moved still farther inwardly so as to cause the hub to be clutched with a fixed part for braking. J p

The object of this invention is to provide a small, and self-contained rear wheel coaster brake hub of this nature which has few parts, whereby. it is cheap to make and easy to assemble, and which parts are so designed and arranged that the action will be sure and satisfactory, without undue strain and wear.

Figure 1 of the accompanying drawings shows acentral longitudinal section of the hub andthe driving and braking clutch parts. Fig. 2 shows a transverse section across the middle of the hub onthe plane indicated by the dotted line 22 on Fig. 1. Fig. 3 shows a side view of the sprocket wheel and its hub which is 1n0vided with the clutch actuating screw. Fig. 4 shows a side view of the fixed member of the braking clutch. Fig. 5 shows a side View of the member of the clutch that is moved outwardly by the screw for making the driving connection between the sprocket and the hub, and is moved in- .wardly for causing the braking connection to be made between the hub and the fixed clutch member.

The cylindrical hub 1 has the usual perforated flanges 2 for the attachment of the spokes, and ball cups 3 at its ends for holding the bearing balls 4. In the interior, and extending inwardly from desirably diametrically opposite sides of the inner wall of the hub, to which they are fixed, are ribs 5, that are designed'to act as splines.

"Loosely fitting in the hub is a sleeve 6. This sleeve has in its outer surface'grooves parts are locked on the axle.

sleeve 6. It is desirable to form ratchetteeth 11 on the inner end of the fixed cone,

and to\place about this enda thin spring frictionring 12. Oil or grease passages 13 are preferably made in this cone to permit the flow of lubricant to its outer surface. A ball cone 14 is threaded on the axle outside of the fixed brake'cone. When the brake coneand the ball cone are tightened t ese The sprocket wheel 15 is desirably screwed upon a threaded section of the ball cone 16 and clamped there by the nut 17. This ball;

cone is held in proper adjustment on the axle by the cone nut 18 which holds the bearingballs 19 in the cup in'the outer end of the sprocket cone.

- ,The'sprocket cone hub 20 is provided with exterior screw threads 21. These screw threads are engaged with internal threads in the nut or movable clutch member 22. The

When the movable clutch member is moved inward for braking, the teeth on its inner end areengaged with the teeth on the inner end of the fixed brake cone. This prevents the movableclutch member from rotating with the double tapered-sleeve, thus providing a double frictional braking contact, that is, when the movable member is forced inward it pushes the sleeve onto the fixed member so that the sleeve makes frictional contact with both thefixed brakecone and the then fixed movable clutch member. The teeth only come in contacton their par.-

v and causes its outer allel sides and are cut deep enough to permit braking contact of the parts, even after considerable wear. The spring friction ring, which is placed about the inner end of the fixed brake cone and also. closely fits the movable clutch member, causes such friction on the latter that it moves longitudinally back and forth and does not turn with the screw on the sprocket hub.v N on-fiuid grease sprocket wheel is held against rotation, the

forward movement of the wheel tends to drag the nut with it. This causes the nut to move'inwardly on the threaded sprocket hub, that is heldstationary, so as to release the wheel and allow it to run free. When the sprocket wheel is given a backward tained in a hub of comparatively small size.

movement, the threaded hub drives the nut inwardly into the tapering end of the longitudinally movable sleeve, andto force this sleeve onto the fixed brake cone. As the sleeve is splined to the wheel hub, this tends to check and stop the rotation of the wheel. When the sprocket is again turned forward, its screw threaded hub draws the movable cone outwardly and releases'the sleeve from the fixed brake cone, freeing the wheel.

There are comparatively few parts in this organization, and these parts are so shaped that they are strong, act efliciently for driving or braking the-hub, and yet are con- The invention claimed'is:

1. A wheel hub having a tapering driving-clutch wall in tarily connected with but longitudinally movable in the hub, said sleeve having outwardly tapering interior walls, an axle, a

- braking cone held against rotation on the axle, and extending into one end of the sleeve, a threaded sprocket hub, a sprocket mounted on said threaded hub, and a nut engaged by the thread on the sprocket hub,

said nut having a tapered external wall at one end that extends into the tapering section of the wheel hub, and having a tapered external wall at the other end that extends into the sleeve. 5

'2. A.wheel hub having a tapering driving-clutch wall in the interior, a sleeve rotarlly connected with but longitudinally movable in the hub, said sleeve havin an outwardly tapering wall at each en an parts and this naturally the interior, a sleeve romoved in the axle, a braking cone fixed on the axle and extending into one end of the sleeve, a threaded sprocket h'ub, a sprocket secured i when moved in one direction, and to engage the tapering end of the sleeve, when moved in the opposite direction.

3. A wheel hub having a tapering driving-clutch wall in the interior, a sleeve with tapering interior walls rotarily connected with but longitudinally movable in the hub, an axle, axle, said cone extending into one end of the sleeve, a threaded hub movable on the axle near the other end, a sprocket secured to said threaded hub, anpl a'nut engaged by the thread on the sprocket hub, said nut being shaped .to engage the interior tapering driving wall of the vwheel hub, when moved in one direction, the sleeve longitudinally onto the fixed cone when moved in the opposite direction.

4. A wheel hub having a tapering driving-clutch wall in the interior, a sleeve rotarily connected with but longitudinally movable in the hub, said sleeve wardly tapering interior walls, an axle,'a braking cone held against rotation on the axle and extending into the sleeve, a ball cone held against rotation on the axle outside of the fixed brake cone, a threaded hub turning on the axle, a sprocket mounted on said threaded hub, and a nut engaged by the thread on the sprocket hub, the exterior Wall of said nut being tapered in opposite directions, one end being adapted to engage the tapered-inner driving wall ofthe wheel hub, and the other end being adapted to. engage the tapering inner wall at one end of the sleeve. r

5. A Wheel hub having a-tapering driving-clutch wall in the interior, a sleeve rotarily connected with but longitudinally movable in'the hub, said sleeve having oppositely tapering interior walls, an-axle, a

braking cone having lubricant passages, screwedon the axle, said cone extending into a stationary cone at one end of the and to engage and .force.

having outone end of the sleeve, a ball cone screwed upon the axle outside of the brake cone, a sprocket having a threaded hub, mounted on the axle, and a nut having oppositely tapering exterior walls, mounted on the thread ed sprocket hub, said nut, when moved in one direction by the threads, engaging and making a driving connection with the interior wallof the Wheel'hub, and when opposite direction, engaging the sleeve and causing said sleeve to make a braking engagement with the fixed brake cone.

- 6. A wheel hub having a tapering driving' clutch wall in the interior, a sleeve splined in the hub, said sleeve having an said nut extending into the tapering section outwardly tapering interior Wall at each of the Wheel hub, and the other end extend- 10 end, anaxle, a, braking cone held againsting into the sleeve.

rotation on the axle and extendin into the sleeve, a sprocket having a, threaded hub HARRY LESTER mounted on the axle, and a nut having op- Witnesses:

positely tapering exterior Walls, mounted BURT SPIVEY,

on the threaded sprocket hub, one end of C. W. FL'IEDNER'.

five cents catch, by addressing the Commissioner of Patents, Washington, D. 0.

Copies of this patent may be obtained for 

